3 lights blinking and moving before disappearing

I've seen 3 lights blinking at different pace. They were aligned in the sky, and from my position of observation they were almost at vertical, I'm not sure how to express this in degree angle. What surprised me, it's when 2 of these lights moved together in a straight line apart from the other one, like they were part of the same object. The motion was quite fast and smooth. Being aware of ET presence, i immediately thought, "that's another sighting" and at that moment, the lights disappeared.
The lights were white, though I may have spot a lite different color at some point but given the fact I just came out of a lighted room before stepping outside in the dark, I can't be sure. They were the size of a big bright star, or a planet like Venus. Since that event I am very very exhausted without explanation and at the beginning I didn't make the connection, but since it lasting despite resting all day long for 2 days, I am questioning if there could be an relationship.